package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.UserHolder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.UUID;
import java.util.concurrent.TimeUnit;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */

@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {


    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result sendCode(String phone, HttpSession session) {
        //1.校验手机号
        if (RegexUtils.isPhoneInvalid(phone)){
            //2.不符合则返回错误信息
            return Result.fail("手机号格式错误");
        }
        //3.符合则生成验证码
        String code = RandomUtil.randomNumbers(6);
        //4.保存验证码
        stringRedisTemplate.opsForValue().set("login:code:"+phone,code,2, TimeUnit.MINUTES);
        //5.返回验证码
        log.debug("发送验证码成功：{}",code);

        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        //1.校验手机号
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)){
            return Result.fail("手机号格式错误");
        }
        // 2.校验验证码
        String cachecode = stringRedisTemplate.opsForValue().get("login:code:"+phone);
        String code = loginForm.getCode();
        if (cachecode == null || !cachecode.equals(code)){
            return Result.fail("验证码格式错误");
        }

        //3.一致，根据手机号查用户
        User user = query().eq("phone", phone).one();
        if (user == null){
            //4.不存在，创建新用户并保存
            user = createUserWithPhone( phone);
        }

        //5.保存用户
        //5.1生成token令牌
        String token = UUID.randomUUID().toString();
        log.info("已生成token令牌："+token);
        //6.将user对象转为Hash村粗
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        //存储
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO, new HashMap<>(),
                CopyOptions.create()
                        .setIgnoreNullValue(true)
                        .setFieldValueEditor((fieldName, fieldValue) -> fieldValue.toString()));
        stringRedisTemplate.opsForHash().putAll("login:user:"+token,userMap);
        //设置有效期
        stringRedisTemplate.expire("login:user:"+token,365,TimeUnit.DAYS);

        return Result.ok(token);
    }

    @Override
    public Result sign() {
        //1.获取当前登录用户
        Long userId = UserHolder.getUser().getId();
        //2.获取日期
        LocalDateTime now = LocalDateTime.now();
        String keySuffix = now.format(DateTimeFormatter.ofPattern("yyyyMM"));
        String key = "sign:"+userId+":"+keySuffix;
        int dayOfMonth = now.getDayOfMonth();
        stringRedisTemplate.opsForValue().setBit(key,dayOfMonth-1,true);

        return Result.ok();
    }
    @Override
    public Result signCount() {
        //1.获取当前登录用户
        Long userId = UserHolder.getUser().getId();
        //2.获取日期
        LocalDateTime now = LocalDateTime.now();
        String keySuffix = now.format(DateTimeFormatter.ofPattern("yyyyMM"));
        String key = "sign:"+userId+":"+keySuffix;
        int dayOfMonth = now.getDayOfMonth();
        List<Long> result = stringRedisTemplate.opsForValue().bitField(
                key,
                BitFieldSubCommands.create()
                        .get(BitFieldSubCommands.BitFieldType.unsigned(dayOfMonth)).valueAt(0)
        );
        if(result == null || result.isEmpty()){
            return Result.ok(0);
        }
        Long num = result.get(0);
        if(num == null || num == 0){
            return Result.ok(0);
        }
        int count = 0;
        while(true){
            if((num & 1) ==0){
                break;
            }else{
                count++;
            }
            num>>=1;
        }
        return Result.ok(count);
    }

    private User createUserWithPhone(String phone) {
        User user = new User();
        user.setPhone(phone);
        user.setNickName("user_"+RandomUtil.randomString(10));
        save(user);
        return user;
    }
}
